Beach
Pirita Beach
Tallinn, Estonia · sea 17.4 °C at its warmest, in August

Sea temperature month by month
Monthly means in °C, NOAA OISST v2.1 climatology 1991–2020, sampled 17 km offshore, at the nearest open water cell of a 0.25° grid.
About
Пи́рита (эст. Pirita rand) — крупнейший морской пляж Таллина, столицы Эстонии. Расположен в одноимённом районе города.
Questions
How warm is the sea at Pirita Beach?
The sea off Pirita Beach averages 17.4 °C at its warmest, in August, and 0.8 °C at its coolest. These are monthly means from NOAA's OISST v2.1 satellite and buoy record for 1991 to 2020, sampled at the beach's own coordinates.
When can you swim at Pirita Beach?
The sea here never averages 20 °C in any month, so swimming means cold water all year. Some people do it anyway.
Where is Pirita Beach?
Pirita Beach is on the coast of Tallinn, Estonia, at 59.4774, 24.8351. The map on this site flies straight to it.